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Message-ID: <20241022084040.3390878-5-ming.qian@nxp.com>
Date: Tue, 22 Oct 2024 17:40:40 +0900
From: Ming Qian <ming.qian@....com>
To: mchehab@...nel.org,
	hverkuil-cisco@...all.nl
Cc: yunkec@...gle.com,
	nicolas@...fresne.ca,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	linux-imx@....com,
	xiahong.bao@....com,
	ming.zhou@....com,
	eagle.zhou@....com,
	tao.jiang_2@....com,
	ming.qian@....nxp.com,
	imx@...ts.linux.dev,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [RFC v3 4/4] media: v4l2-ctrls: Add video encoder ROI ctrls

Add some ctrls to support the video encoder region-of-interest(ROI)
feature. The ROI QP Map and rectangular configuration are supported.

Signed-off-by: Ming Qian <ming.qian@....com>
Signed-off-by: TaoJiang <tao.jiang_2@....com>
---
 .../media/v4l/ext-ctrls-codec.rst             | 95 +++++++++++++++++++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c     | 46 +++++++++
 include/uapi/linux/v4l2-controls.h            | 16 ++++
 3 files changed, 157 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 4a379bd9e3fb..7188d8212677 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -1667,6 +1667,101 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
     Codecs need to always use the specified range, rather then a HW custom range.
     Applicable to encoders
 
+``V4L2_CID_MPEG_VIDEO_ROI_MODE``
+    (enum)
+
+enum v4l2_mpeg_video_roi_mode -
+    Indicates Video Encoding region-of-interest (ROI) Mode.
+    Possible values are:
+
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_MPEG_VIDEO_ROI_MODE_NONE``
+      - No ROI in the MPEG stream
+    * - ``V4L2_MPEG_VIDEO_ROI_MODE_RECT_DELTA_QP``
+      - Rectangle ROI mode and specifies ROI delta QP.
+    * - ``V4L2_MPEG_VIDEO_ROI_MODE_RECT_PRIORITY``
+      - Rectangle ROI mode and specifies ROI priority.
+    * - ``V4L2_MPEG_VIDEO_ROI_MODE_MAP_DELTA_QP``
+      - Map ROI mode and specifies ROI delta QP
+    * - ``V4L2_MPEG_VIDEO_ROI_MODE_MAP_ABSOLUTE_QP``
+      - Map ROI mode and specifies ROI absolute QP value
+
+``V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE (struct)``
+    This control returns the ROI block size in pixels. The struct
+    :c:type:`v4l2_area` provides the width and height in separate
+    fields. The resolution of the frame will be rounded up to be
+    aligned to this value when it's partitioned in blocks for QP
+    maps and the number of QP values in those maps will be the
+    number of blocks of these indicated pixel size that comprise
+    a full frame. This control depends on the encoding format,
+    and the detailed encoder hardware.
+    Applicable to encoders.
+
+``V4L2_CID_MPEG_VIDEO_ROI_RECT (struct)``
+    A struct :c:type:`v4l2_rect` provides the rectangular region
+    described by the position of its top-left corner, the width
+    and the height. The unit is in pixels. And it should be aligned
+    to the ROI block size, which can be queried from
+    ``V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE``. X,Y gets rounded down,
+    and width/height up. The maximum number of rectangular regions
+    depends on the hardware. This control is a dynamically sized array.
+    This control is applicable when ``V4L2_CID_MPEG_VIDEO_ROI_MODE``
+    value is ``V4L2_MPEG_VIDEO_ROI_MODE_RECT_DELTA_QP`` or
+    ``V4L2_MPEG_VIDEO_ROI_MODE_RECT_PRIORITY``. For overlapping
+    regions, the value that is first in the ROI array will have priority.
+    Applicable to encoders.
+
+``V4L2_MPEG_VIDEO_ROI_MODE_RECT_DELTA_QP (integer)``
+    Specifies the ROI delta QP of a rectangular region. The delta QP
+    is the value that will be added on top of the frame level QP.
+    It can be positive (more distortion) or negative (less distortion)
+    values. This control is applicable when
+    ``V4L2_CID_MPEG_VIDEO_ROI_MODE`` value is
+    ``V4L2_MPEG_VIDEO_ROI_MODE_RECT_DELTA_QP``, and need to be used
+    in combination with ``V4L2_CID_MPEG_VIDEO_ROI_RECT``.
+    This control is a dynamically sized array, and the array size
+    should match ``V4L2_CID_MPEG_VIDEO_ROI_RECT``.
+    Applicable to encoders.
+
+``V4L2_MPEG_VIDEO_ROI_MODE_RECT_PRIORITY (integer)``
+    Specifies the ROI priority of a rectangular region. it can
+    be positive (more important) or negative (less important)
+    values and is compared with non-ROI region (taken as value 0).
+    This control is applicable when ``V4L2_CID_MPEG_VIDEO_ROI_MODE``
+    value is ``V4L2_MPEG_VIDEO_ROI_MODE_RECT_PRIORITY``, and need
+    to be used in combination with ``V4L2_CID_MPEG_VIDEO_ROI_RECT``.
+    Applicable to encoders.
+
+``V4L2_CID_MPEG_VIDEO_ROI_MAP_DELTA_QP (integer)``
+    This is to configure ROI as a map as an integer array,
+    each value represents the delta QP of a block region
+    in raster scan order. The block size can be got from
+    ``V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE``. This control is a
+    dynamically sized array, the array size can be calculated
+    from video resolution and the ROI block size, and the
+    width and height should be rounded up to be aligned to
+    the block size. This control is applicable when
+    ``V4L2_CID_MPEG_VIDEO_ROI_MODE`` value is
+    ``V4L2_CID_MPEG_VIDEO_ROI_MAP_DELTA_QP``.
+    Applicable to encoders.
+
+``V4L2_CID_MPEG_VIDEO_ROI_MAP_ABSOLUTE_QP (integer)``
+    This is to configure ROI as a map as an integer array,
+    each value represents the absolute QP of a block region
+    in raster scan order. The block size can be got from
+    ``V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE``. This control is a
+    dynamically sized array, the array size can be calculated
+    from video resolution and the ROI block size, and the
+    width and height should be rounded up to be aligned to
+    the block size. This control is applicable when
+    ``V4L2_CID_MPEG_VIDEO_ROI_MODE`` value is
+    ``V4L2_CID_MPEG_VIDEO_ROI_MAP_ABSOLUTE_QP``.
+    Applicable to encoders.
+
 .. raw:: latex
 
     \normalsize
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index 1ea52011247a..4d89309bf8d0 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -612,6 +612,15 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
 		NULL,
 	};
 
+	static const char * const mpeg_video_roi_mode[] = {
+		"None",
+		"Rectangle Delta QP",
+		"Rectangle Priority",
+		"Map Delta QP",
+		"Map Absolute QP",
+		NULL,
+	};
+
 	switch (id) {
 	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
 		return mpeg_audio_sampling_freq;
@@ -750,6 +759,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
 		return camera_orientation;
 	case V4L2_CID_MPEG_VIDEO_INTRA_REFRESH_PERIOD_TYPE:
 		return intra_refresh_period_type;
+	case V4L2_CID_MPEG_VIDEO_ROI_MODE:
+		return mpeg_video_roi_mode;
 	default:
 		return NULL;
 	}
@@ -971,6 +982,13 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_MPEG_VIDEO_FRAME_LTR_INDEX:		return "Frame LTR Index";
 	case V4L2_CID_MPEG_VIDEO_USE_LTR_FRAMES:		return "Use LTR Frames";
 	case V4L2_CID_MPEG_VIDEO_AVERAGE_QP:			return "Average QP Value";
+	case V4L2_CID_MPEG_VIDEO_ROI_MODE:		return "Video ROI Mode";
+	case V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE:	return "Video ROI Block Size";
+	case V4L2_CID_MPEG_VIDEO_ROI_RECT:		return "Video ROI Rectangle Region";
+	case V4L2_CID_MPEG_VIDEO_ROI_RECT_DELTA_QP:	return "Video ROI Rectangle Delta QP";
+	case V4L2_CID_MPEG_VIDEO_ROI_RECT_PRIORITY:	return "Video ROI Rectangle Priority";
+	case V4L2_CID_MPEG_VIDEO_ROI_MAP_DELTA_QP:	return "Video ROI Delta QP Map";
+	case V4L2_CID_MPEG_VIDEO_ROI_MAP_ABSOLUTE_QP:	return "Video ROI Absolute QP Map";
 	case V4L2_CID_FWHT_I_FRAME_QP:				return "FWHT I-Frame QP Value";
 	case V4L2_CID_FWHT_P_FRAME_QP:				return "FWHT P-Frame QP Value";
 
@@ -1512,6 +1530,34 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 		*type = V4L2_CTRL_TYPE_INTEGER;
 		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
 		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_MODE:
+		*type = V4L2_CTRL_TYPE_MENU;
+		*flags |= V4L2_CTRL_FLAG_UPDATE;
+		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE:
+		*type = V4L2_CTRL_TYPE_AREA;
+		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
+		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_RECT:
+		*type = V4L2_CTRL_TYPE_RECT;
+		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY | V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX;
+		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_RECT_DELTA_QP:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY | V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX;
+		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_RECT_PRIORITY:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY | V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX;
+		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_MAP_DELTA_QP:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY | V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX;
+		break;
+	case V4L2_CID_MPEG_VIDEO_ROI_MAP_ABSOLUTE_QP:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY | V4L2_CTRL_FLAG_HAS_WHICH_MIN_MAX;
+		break;
 	case V4L2_CID_PIXEL_RATE:
 		*type = V4L2_CTRL_TYPE_INTEGER64;
 		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 974fd254e573..bf67d53af737 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -900,6 +900,22 @@ enum v4l2_mpeg_video_av1_level {
 
 #define V4L2_CID_MPEG_VIDEO_AVERAGE_QP  (V4L2_CID_CODEC_BASE + 657)
 
+enum v4l2_mpeg_video_roi_mode {
+	V4L2_MPEG_VIDEO_ROI_MODE_NONE,
+	V4L2_MPEG_VIDEO_ROI_MODE_RECT_DELTA_QP,
+	V4L2_MPEG_VIDEO_ROI_MODE_RECT_PRIORITY,
+	V4L2_MPEG_VIDEO_ROI_MODE_MAP_DELTA_QP,
+	V4L2_MPEG_VIDEO_ROI_MODE_MAP_ABSOLUTE_QP
+};
+
+#define V4L2_CID_MPEG_VIDEO_ROI_MODE			(V4L2_CID_CODEC_BASE + 658)
+#define V4L2_CID_MPEG_VIDEO_ROI_BLOCK_SIZE		(V4L2_CID_CODEC_BASE + 659)
+#define V4L2_CID_MPEG_VIDEO_ROI_RECT			(V4L2_CID_CODEC_BASE + 660)
+#define V4L2_CID_MPEG_VIDEO_ROI_RECT_DELTA_QP		(V4L2_CID_CODEC_BASE + 661)
+#define V4L2_CID_MPEG_VIDEO_ROI_RECT_PRIORITY		(V4L2_CID_CODEC_BASE + 662)
+#define V4L2_CID_MPEG_VIDEO_ROI_MAP_DELTA_QP		(V4L2_CID_CODEC_BASE + 663)
+#define V4L2_CID_MPEG_VIDEO_ROI_MAP_ABSOLUTE_QP		(V4L2_CID_CODEC_BASE + 664)
+
 /*  MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */
 #define V4L2_CID_CODEC_CX2341X_BASE				(V4L2_CTRL_CLASS_CODEC | 0x1000)
 #define V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE		(V4L2_CID_CODEC_CX2341X_BASE+0)
-- 
2.43.0-rc1


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